A Fully Screen-Printed Vanadium-Dioxide Switches Based Wideband Reconfigurable Intelligent Surface for 5G Bands
arxiv(2024)
摘要
Reconfigurable Intelligent Surface (RIS) is attracting more and more research
interest because of its ability to reprogram the radio environment. Designing
and implementing the RIS, however, is challenging because of limitations of
printed circuit board (PCB) technology related to manufacturing of large sizes
as well as the cost of switches. Thus, a low-cost manufacturing process
suitable for large size and volume of devices, such as screen-printing is
necessary. In this paper, for the first time, a fully screen-printed
reconfigurable intelligent surface (RIS) with vanadium dioxide (VO2) switches
for 5G and beyond communications is proposed. A VO2 ink has been prepared and
batches of switches have been printed and integrated with the resonator
elements. These switches are a fraction of the cost of commercial switches.
Furthermore, the printing of these switches directly on metal patterns negates
the need of any minute soldering of the switches. To avoid the complications of
multilayer printing and realizing the RIS without vias, the resonators and the
biasing lines are realized on a single layer. However, this introduces the
challenge of interference between the biasing lines and the resonators, which
is tackled in this work by designing the bias lines as part of the resonator.
By adjusting the unit cell periodicity and the dimension of the H-shaped
resonator, we achieve a 220 to 170 phase shift from 23.5 GHz to 29.5 GHz
covering both n257 and n258 bands. Inside the wide bandwidth, the maximum ON
reflection magnitude is 74
array comprises 20x20 unit cells (4.54x4.54λ^2 at 29.5 GHz). Each
column of unit cells is serially connected to a current biasing circuit. To
validate the array's performance, we conduct full-wave simulations as well as
near-field and far-field measurements.
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